I receive 2 bills every m onth for stack analysis report of Rs 8989/- each. I want to know when i am suppose to deduct the tds on professional fees @ 10%. Is it on every m onths bill or only after he crosses the limit of Rs 30000/-. But when i reach his fourth bill the amount comes to Rs 35956/- have i to less the 30000 lt and deduct the tds on 5956/- amount?